Lamp fixing holder and back light assembly having the same

ABSTRACT

There is provided a lamp fixing holder. A lamp fixing holder for fixes a lamp to a receiving container. The lamp provides a liquid crystal display panel with light. The lamp includes a first portion of a face and a second portion of the face. The light emitted from the first portion of the face advances toward the liquid crystal display panel. The lamp fixing holder comprises a lamp fixing body and a fixing member. The lamp fixing body holds a third portion of the face of the lamp. The second portion includes the third portion. The fixing member fixes the lamp fixing body to the receiving container. The lamp fixing holder according to the present invention fixes the lamp so that the lamp does not sway, while minimizing an amount of light that is shielded by the lamp fixing holder.

TECHNICAL FIELD

This disclosure relates to a lamp fixing holder and a back lightassembly having the lamp fixing holder, and more particularly to a lampfixing holder for minimizing the light loss and a back light assemblyhaving the same.

BACKGROUND ART

Users perceive an image-information processed by aninformation-processing device through the display device.

A liquid crystal display (LCD) device, which is one of the displaydevices, displays an image-information using liquid crystal of whichtransmissivity is changed according to the electric field applied theliquid crystal.

The liquid crystal regulates only the transmissivity. Therefore, a lightsource is needed so as to display an image.

A lamp is used as a light source. For example, a cold cathodefluorescent lamp (CCFL) is used as a lamp for supplying a liquid crystaldisplay panel of the liquid crystal display device with light.

The cold cathode fluorescent lamp has many merits. For example, the coldcathode fluorescent lamp may have a cylindrical shape having a smalldiameter. The cold cathode fluorescent lamp generates white light thatis similar to the solar light. The cold cathode fluorescent lamp has along life span. The cold cathode fluorescent lamp generates a smallamount of heat.

The cold cathode fluorescent lamp may be arranged variously according toa size of the liquid crystal display device.

In a small sized or in a middle sized liquid crystal display device, oneor two cold cathode fluorescent lamps may be disposed adjacent to theside of a light guide plate (LGP), because one or two cold cathodefluorescent lamps provide the liquid crystal display panel with enoughlight to display an image. The liquid crystal display device describedabove is referred to as an edge-illumination type liquid crystal displaydevice.

Comparatively, in a large sized liquid crystal display device, more thanthree cold cathode fluorescent lamps are needed so as to provide theliquid crystal display panel with enough light. In a large sized liquidcrystal display device, cold cathode fluorescent lamps are arrangedparallel with each other. The cold cathode fluorescent lamps aredisposed under the liquid crystal display panel so as to apply light tothe liquid crystal display panel. This liquid crystal display device isreferred to as a direct-illumination type liquid crystal display device.

Nowadays, a size of a display panel becomes larger. Therefore, a lengthof the cold cathode fluorescent lamp also becomes longer. When thelength of the cold cathode fluorescent lamp becomes longer, the coldcathode fluorescent lamp sags due to a weight thereof. When the coldcathode fluorescent lamp sags, the cold cathode fluorescent lampprovides the liquid crystal display panel with non-uniform light.Therefore, the display quality of the liquid crystal display device isdeteriorated.

DISCLOSURE OF THE INVENTION

The present invention provides a lamp fixing holder for fixing the lamp.The lamp provides a liquid crystal display panel with light. The lampfixing holder minimizes the light loss.

The present invention also provides a back light assembly having thelamp fixing holder for fixing a lamp. The lamp fixing holder fixes thelamp, so that the deviation of the luminance and light loss areminimized. Therefore, the luminance is enhanced.

In one aspect of the invention, there is provided a lamp fixing holderfor fixing a lamp to a receiving container. The lamp provides a liquidcrystal display panel with light. The lamp includes a first portion of aface and a second portion of the face. The light emitted from the firstportion of the face advances toward the liquid crystal display panel.The lamp fixing holder comprises a lamp fixing body and a fixing member.The lamp fixing body holds a third portion of the face of the lamp. Thesecond portion includes the third portion. The fixing member fixes thelamp fixing body to the receiving container.

In another aspect, there is provided a lamp fixing holder for fixing alamp applying light to a liquid crystal display panel. The lamp fixingholder comprises a lamp support ring, a fixing rod, a separationpreventing member and a pressing member. The lamp is inserted into thelamp support ring. The fixing rod protrudes from the lamp support ring.The separation preventing member prevents the fixing rod from beingseparated from a receiving container. The separation preventing memberhas a first portion and a second portion. The first portion and thesecond portion protrude from the fixing rod toward the lamp fixing body.The first portion is symmetrical with the second portion with respect toa longitudinal direction of the fixing rod. The pressing member has athird portion and a fourth portion. The third portion and the fourthportion protrude from the portion of the fixing rod toward theseparation preventing member. The portion of the fixing rod is disposedbetween the separation preventing member and the lamp fixing body. Thethird portion is symmetrical with the fourth portion with respect to,the longitudinal direction of the fixing rod. The pressing memberpresses the receiving container toward the separation preventing member,when the fixing rod being inserted into the hole of the receivingcontainer.

In further aspect, there is provided a back light assembly comprises areceiving container for receiving a liquid crystal display panel, a lampfor providing the liquid crystal display panel with a light, a lampfixing body for fixing the lamp, and a fixing member for fixing the lampfixing body to the receiving container.

The lamp fixing holder according to the present invention fixes thelamp, so that the lamp does not sway. Further, the lamp fixing holderminimizes an amount of light that is shielded by the lamp fixing holder,so that the display quality is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other advantages of the present invention will becomereadily apparent by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings wherein:

FIG. 1 is a perspective view showing a lamp fixing holder according to afirst exemplary embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along the line A-A′ of FIG. 1;

FIG. 3 is a perspective view showing a lamp fixing holder according to asecond exemplary embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along the line B-B′ of FIG. 3;

FIG. 5 is a perspective view showing a lamp fixing holder according to athird exemplary embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along the line C-C′ of FIG. 5;

FIG. 7 is a perspective view showing a lamp fixing holder according to afourth exemplary embodiment of the present invention;

FIG. 8 is a cross-sectional view taken along the line D-D′ of FIG. 7;

FIG. 9 is a perspective view showing a lamp fixing holder according to afifth exemplary embodiment of the present invention;

FIG. 10 is a cross-sectional view taken along the line E-E′ of FIG. 9;

FIG. 11 is a perspective view showing a lamp fixing holder according toa sixth exemplary embodiment of the present invention;

FIG. 12 is a cross-sectional view taken along the line F-F′ of FIG. 11;and

FIG. 13 is a perspective view showing a back light assembly having oneof a lamp fixing holder of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1

FIG. 1 is a perspective view showing a lamp fixing holder of the firstexemplary embodiment of the present invention and FIG. 2 is across-sectional view taken along the line A-A′ of FIG. 1.

Referring, to FIGS. 1 and 2, a lamp fixing holder 100 includes a lampfixing body 110 and a fixing member 120.

The lamp fixing body 110 fixes a lamp 130 having cylindrical shape. Thefixing member 120 fixes the lamp fixing body 110 to a receivingcontainer 200.

The lamp fixing body 110 supports the lamp 130, while minimizing thelight loss. In order to reduce the light loss, the cross-section of thelamp fixing body 110 has an arc shape. The lamp 130 is inserted into thelamp fixing body 110 of which cross-section has arc shape.

Referring to FIG. 2, the arc of the cross-section of the lamp fixingbody 110 is defined a first arc A₁ and the remaining arc is defined asecond arc A₂. The sum of the first arc A₁ and the second arc A₂ issubstantially same as the length of the circumference of the lamp 130.

A ratio of the first arc A₁ to the length of the second arc A₂ affectsthe light-using efficiency and the force of connection between the lampfixing body 110 and the lamp 130.

When the length of the first arc A₁ becomes larger and the length of thesecond arc A₂ becomes smaller, the force of connection between the lampfixing body 110 and the lamp 130 becomes stronger but the light-usingefficiency becomes lower.

However, when the length of the first arc A₁ becomes smaller and thelength of the second arc A₂ becomes larger, the force of connectionbetween the lamp fixing body 110 and the lamp 130 becomes weaker but thelight-using efficiency becomes higher.

In the embodiment of the present invention, for example, the first arcA₁ is longer than (or at least same as) the second arc A₂.

The fixing member 120 fixes the lamp fixing body 110 to a receivingcontainer 200. A double-faced adhesive tape or an adhesive agent may beused as the fixing member 120. In this embodiment, for example, thedouble-faced adhesive tape is used as the fixing member 120.

The double-faced adhesive tape 120 fixes the lamp fixing body 110 to thereceiving container 200 so as to prevent the lamp fixing body 110 fromswaying of the lamp 130.

Embodiment 2

FIG. 3 is a perspective view showing a lamp fixing holder of the secondembodiment of the present invention, and FIG. 4 is a cross-sectionalview taken along the line B-B′ of FIG. 3.

Referring to FIGS. 3 and 4, a lamp fixing holder 300 includes a pair oflamp fixing bodies 115 and fixing member 116.

The lamp fixing bodies 115 forms a pair. Each of the lamp fixing bodies115 has a stick-shape. Each of the lamp fixing bodies 115 is spacedapart by a distance that is equal to a diameter of the lamp 130 so as tofix a lamp 130. The lamp fixing bodies 115 are fixed to a receivingcontainer 200 with a fixing member 116. The fixing member 116 may be adouble-faced adhesive tape or an adhesive agent.

Embodiment 3

FIG. 5 is a perspective view showing a lamp fixing holder of the thirdembodiment of the present invention, and FIG. 6 is a cross-sectionalview taken along the line C-C′ of FIG. 5.

Referring to FIGS. 5 and 6, a lamp fixing holder 500 includes a lampfixing body 117 and a fixing rod 118 protruding from the lamp fixingbody 117.

The lamp fixing body 117 supports the lamp 130. The fixing rod 118 fixesthe lamp fixing body 117 to a receiving container 200.

The lamp fixing body 117 supports the lamp 130, while minimizing thelight loss.

In order to minimize the light loss, the cross-section of the lampfixing body 117 has an arc shape. The lamp 130 having a cylindricalshape is inserted to the lamp fixing body 117.

The fixing rod 118 fixes the lamp fixing body 117 to the receivingcontainer 200. In case that the fixing rod 118 fixes the lamp fixingbody 117 to the receiving container 200, the lamp fixing body 117 may beeasily detached.

A diameter of the fixing rod 118 is substantially same as the diameterof a hole 210 of the receiving container 200, so that when the fixingrod 118 of the fixing rod 118 is inserted into the hole 210, the lampfixing holder 500 is fixed strongly.

Embodiment 4

FIG. 7 is a perspective view showing a lamp fixing holder of the fourthembodiment of the present invention and FIG. 8 is a cross-sectional viewtaken along the line D-D′ of FIG. 7.

Referring to FIGS. 7 and 8, when a fixing rod 118 having separationpreventing piece 118 a is inserted into a hole 215, a fixing rod 118 maynot be easily detached from the receiving container 200 by externalimpact. When the fixing rod 118 is detached from the receiving container200, the lamp 130 may sway or the lamp 130 may be broken.

The separation preventing piece 118 a prevents the fixing rod 118 frombeing detached from the receiving container 200.

The fixing rod includes a first portion and a second portion.

The separation preventing piece 118 a protrudes from the fixing rod 118toward the lamp fixing body 117, so that when the fixing rod 118 isinserted into the hole 215 easily, but the fixing rod 118 is notdetached easily from the receiving container 200 when the fixing rod 118is inserted. Namely, the separation preventing piece 118 a has asymmetrical arrow-shape with respect to a longitudinal direction of thefixing rod 118.

The separation preventing piece 118 a includes elastic materials.Therefore, when the fixing rod 118 is inserted into the hole 215 of thereceiving container 200, each of the first portion and the secondportion of the separation preventing piece 118 a are transformed.

When the fixing rod 118 is inserted into the hole 215 completely, theseparation preventing piece 118 a is restored to an original state.

A diameter of the hole 215 formed on the receiving container 200 islarger than the diameter of the fixing rod 118, so that the fixing rod118 having the separation preventing piece 118 a is inserted into thehole 215 easily. However, when the diameter of the hole 215 is largerthan the diameter of the fixing rod 118, the lamp fixing holder 700 isfixed unstably to the receiving container 200.

Therefore, a length of the fixing rod 118 or the length of theseparation preventing piece 118 a is regulated, such that both ends ofthe separation preventing piece 118 a make contact with the receivingcontainer 200. Therefore, the lamp fixing holder 700 is fixed to thereceiving container 200 stably.

Embodiment 5

FIG. 9 is a perspective view showing a lamp fixing holder of the fifthembodiment of the present invention, and FIG. 10 is a cross-sectionalview taken along the line E-E′ of FIG. 9.

Referring to FIGS. 9 and 10, a separation preventing piece 118 a and apressing piece 118 b protrude from the fixing rod 118.

The separation preventing piece 118 a includes a first portion and thesecond portion. The first portion is symmetric with the second portionwith respect to a longitudinal direction of the fixing rod 118.

The first portion and the second portion of the separation preventingpiece 118 a protrude from the fixing rod 118 toward a lamp fixing body117, so that the separation preventing piece 118 a has an arrow-shapedirecting downward. Therefore, the fixing rod 118 may be insertedeasily.

The pressing piece 118 b is disposed between the lamp fixing body 117and the separation preventing piece 118 a. The pressing piece 118 bincludes a third portion and the fourth portion. The third portion issymmetric with the fourth portion with respect to a longitudinaldirection of the fixing rod 118.

The third portion and the fourth portion of the pressing piece 118 bprotrude from the fixing rod 118 toward the separation preventing piece118 a, so that the pressing piece 118 b has an arrow-shape directingupward.

When the fixing rod 118 is inserted into the hole 217 of the receivingcontainer 200, the pressing piece 118 b presses the receiving container200, so that both ends of the first portion and the second portion ofthe separation preventing piece 118 a makes contact with the receivingcontainer 200.

Therefore, the separation preventing piece 118 a and the pressing piece118 b fix the lamp fixing holder 900 to the receiving container 200stably.

The separation preventing piece 118 a includes elastic materials.Therefore, when the fixing rod 118 is inserted into the hole 215 of thereceiving container 200, each of the first portion and the secondportion of the separation preventing piece 118 a are transformed.

When the fixing rod 118 is inserted into the hole 215 completely, theseparation preventing piece 118 a is restored to an original state.

Embodiment 6

FIG. 11 is a perspective view showing a lamp fixing holder of the sixthembodiment of the present invention and FIG. 12 is a cross-sectionalview taken along the line F-F′ of FIG. 11.

Referring to FIGS. 11 and 12, lamp fixing holder 910 includes a lampsupport ring 119, a fixing rod 118, a separation preventing piece 118 aand a pressing piece 118 b.

The lamp support ring 119 has a ring shape to grip a lamp 130 having acylindrical shape.

The separation preventing piece 118 a includes a first portion and thesecond portion. The first portion is symmetric with the second portionwith respect to a longitudinal direction of the fixing rod 118.

The first portion and the second portion of the separation preventingpiece 118 a protrude from the fixing rod 118 toward a lamp fixing body117, so that the separation preventing piece 118 a has an arrow-shapedirecting downward. Therefore, the fixing rod 118 may be insertedeasily.

The fixing rod 118 protrudes from the lamp support ring 119. The fixingrod 118 is inserted into a hole 218 of a receiving container 200.

The pressing piece 118 b is disposed between the lamp fixing body 117and the separation preventing piece 118 a. The pressing piece 118 bincludes a third portion and the fourth portion. The third portion issymmetric with the fourth portion with respect to a longitudinaldirection of the fixing rod 118.

The third portion and the fourth portion of the pressing piece 118 bprotrude from the fixing rod 118 toward the separation preventing piece118 a, so that the pressing piece 118 b has an arrow-shape directingupward.

When the fixing rod 118 is inserted into the hole 217 of the receivingcontainer 200, the pressing piece 118 b presses the receiving container200, so that both ends of the first portion and the second portion ofthe separation preventing piece 118 a makes contact with the receivingcontainer 200.

Therefore, the separation preventing piece 118 a and the pressing piece118 b fix the lamp fixing holder 900 to the receiving container 200stably.

The separation preventing piece 118 a includes elastic materials.Therefore, when the fixing rod 118 is inserted into the hole 215 of thereceiving container 200, each of the first portion and the secondportion of the separation preventing piece 118 a are transformed.

When the fixing rod 118 is inserted into the hole 215 completely, theseparation preventing piece 118 a is restored to an original state.

FIG. 13 is a perspective view of back light assembly having one of alamp fixing holder of the present invention.

Referring to FIG. 13, a back light assembly 500 includes a receivingcontainer 200, a lamp 130, a lamp fixing holder 100 and back light unit400.

The receiving container 200 has bottom face 220 having a predeterminedarea, and a plurality of sidewalls 230 elongated vertically from theedge of the bottom face 230 to form a receiving space. The receivingcontainer 200 is combined with a liquid crystal display panel.

A plurality of lamps 130 is arranged parallel with each other on thebottom face 220 of the receiving container 200.

A lamp fixing holder 100 fixed on the bottom face 220 fixes the lamp130. In FIG. 13, the lamp fixing holder 100 of the first embodiment ofFIGS. 1 and 2 fixes the lamp 130. However, the lamp fixing holder 100may be one of the lamp fixing holders of the second embodiment to thesixth embodiment.

The back light unit 400 includes a reflector 410 and diffusion plate420.

The reflector 410 is disposed between the bottom face 220 of thecontainer 200 and the lamps 130 so as to reflect the light advancingtoward the bottom face 220. The reflector 410 enhances the light usingefficiency.

The diffusion plate 420 makes the luminance of the light generated bythe lamps 130 uniform, so that high quality display is achieved.

INDUSTRIAL APPLICABILITY

According to present invention, a lamp fixing holder for fixing a lampthat supplies a liquid crystal display device with light, prevents thelamp from swaying, while minimizing the light loss.

Although the exemplary embodiments of the present invention have beendescribed, it is understood that the present invention should not belimited to these exemplary embodiments but various changes andmodifications can be made by one ordinary skilled in the art within thespirit and scope of the present invention as hereinafter claimed.

1. A lamp fixing holder for fixing a lamp to a receiving containers, thelamp providing a liquid crystal display panel with light, the lampincluding a first portion of a face and a second portion of the face,the light emitted from the first portion of the face advancing towardthe liquid crystal display panel, the lamp fixing holder comprising; alamp fixing body comprising a continuous arcuate top surface for holdinga third portion of the face of the lamp, the second portion includingthe third portion, wherein the top surface of the lamp fixing bodycontinuously contacts a first arc of a circumference of the lamp havinga cylindrical shape, the first arc being longer than a second arc, a sumof the first arc and the second arc being equal to the circumference ofthe lamp; and a fixing member for fixing the lamp fixing body to thereceiving container.
 2. The lamp fixing holder of claim 1, wherein thefirst arc corresponds to the circumference of the lamp.
 3. The lampfixing holder of claim 1, wherein the fixing member includes adouble-faced adhesive tape.
 4. The lamp fixing holder of claim 1,wherein the fixing member includes a fixing rod, the fixing rodprotruding from the lamp fixing body, and the fixing rod being insertedinto a hole formed on the receiving container.
 5. The lamp fixing holderof claim 1, wherein the fixing member includes: a fixing rod protrudingfrom the lamp fixing body, the fixing rod being inserted into a hole ofthe receiving container; and a separation preventing member forpreventing the fixing rod from being separated from the receivingcontainer, the separation preventing member having a first portion and asecond portion, the first portion and the second portion protruding fromthe fixing rod toward the lamp fixing body, the first portion beingsymmetrical with the second portion with respect to a longitudinaldirection of the fixing rod.
 6. The lamp fixing holder of claim 5,wherein both of ends of the first portion and the second portion makescontact with the receiving container when the fixing rod being insertedinto the hole of the receiving container.
 7. The lamp fixing holder ofclaim 5, further comprises a pressing member having a third portion anda fourth portion, the third portion and the fourth portion protrudingfrom the a portion of the fixing rod toward the separation preventingmember, the portion of the fixing rod being disposed between theseparation preventing member and the lamp fixing body, the third portionbeing symmetrical with the fourth portion with respect to thelongitudinal direction of the fixing rod, the pressing member pressingthe receiving container toward the separation preventing member when thefixing rod being inserted into the hole of the receiving container.
 8. Alamp fixing holder for fixing a lamp applying light to a liquid crystaldisplay panel, comprising: a lamp support ring, comprising a continuousarcuate inner surface for holding the lamp having a cylindrical shapeinserted into the lamp support ring, wherein the inner surface of thelamp support ring continuously contacts a circumference of the lamp; afixing rod protruding from the lamp support ring; a separationpreventing member for preventing the fixing rod from being separatedfrom a receiving container, the separation preventing member having afirst portion and a second portion, the first portion and the secondportion protruding from the fixing rod toward the lamp fixing body, thefirst portion being symmetrical with the second portion with respect toa longitudinal direction of the fixing rod; and a pressing member havinga third portion and a fourth portion, the third portion and the fourthportion protruding from the a portion of the fixing rod toward theseparation preventing member, the portion of the fixing rod beingdisposed between the separation preventing member and the lamp fixingbody, the third portion being symmetrical with the fourth portion withrespect to the longitudinal direction of the fixing rod, the pressingmember pressing the receiving container toward the separation preventingmember when the fixing rod being inserted into the hole of the receivingcontainer.
 9. A back light assembly comprising: a receiving containerfor receiving a liquid crystal display panel; a lamp for providing theliquid crystal display panel with a light; a lamp fixing body for fixingthe lamp, wherein the lamp fixing body comprises a continuous arcuatetop surface for holding the lamp, wherein the top surface of the lampfixing body continuously contacts a first arc of a circumference of thelamp having a cylindrical shape, the first arc being longer than asecond arc, a sum of the first arc and the second arc being equal to thecircumference of the lamp; and a fixing member for fixing the lampfixing body to the receiving container.
 10. The back light assembly ofclaim 9, wherein the lamp includes a first portion of a face and asecond portion of the face, the light emitted from the first portion ofthe face advancing toward the liquid crystal display panel, the lampfixing body holding a third portion of the face of the lamp, the secondportion including the third portion.
 11. The back light assembly ofclaim 9, wherein the lamp fixing body enwraps a first arc of acircumference of the lamp having cylindrical shape, the first arc beinglonger than a second arc, a sum of the first arc and the second arcbeing equal to the circumference of the lamp.
 12. The back lightassembly of claim 9, wherein the fixing member includes a double-facedadhesive tape.
 13. The back light assembly of claim 9, wherein thefixing member includes: a fixing rod protruding from the lamp fixingbody, the fixing rod being inserted into a hole of the receivingcontainer; and a separation preventing member for preventing the fixingrod from being separated from the receiving container, the separationpreventing member having a first portion and a second portion, the firstportion and the second portion protruding from the fixing rod toward thelamp fixing body, the first portion being symmetrical with the secondportion with respect to a longitudinal direction of the fixing rod. 14.The back light assembly of claim 13, wherein both of ends of the firstportion and the second portion makes contact with the receivingcontainer when the fixing rod being inserted into the hole of thereceiving container.
 15. The back light assembly of claim 13, furthercomprises a pressing member having a third portion and a fourth portion,the third portion and the fourth portion protruding from the a portionof the fixing rod toward the separation preventing member, the portionof the fixing rod being disposed between the separation preventingmember and the lamp fixing body, the third portion being symmetricalwith the fourth portion with respect to the longitudinal direction ofthe fixing rod, the pressing member pressing the receiving containertoward the separation preventing member when the fixing rod beinginserted into the hole of the receiving container.
 16. The back lightassembly of claim 9, wherein the first arc corresponds to thecircumference of the lamp.